//
//  MainViewController.swift
//  Weibo1
//
//  Created by apple on 15/12/26.
//  Copyright © 2015年 idcast. All rights reserved.
//

import UIKit


class MainViewController: UITabBarController {
    //MARK: 监听方法
    ///点击撰写按钮
   @objc private func clickComposedButton() {
    
        print("点击撰写按钮")
    }

    //MARK: 试图生命周期函数
    override func viewDidLoad() {
        super.viewDidLoad()
      addChildViewControllers()
        
        setupComposedButton()
    }
    
    override func viewWillAppear(animated: Bool) {
        //会创建tabbar中的所有控制器对应的按钮
        super.viewWillAppear(animated)
        
        //将撰写按钮弄到最前面
        tabBar.bringSubviewToFront(composedButton)
    }
    //MARK: 懒加载控件
    private lazy var composedButton: UIButton = UIButton(imageName: "tabbar_compose_icon_add", backImageName: "tabbar_compose_button")
}


//MARK: 设置界面
extension MainViewController {
    ///设置撰写按钮
    private func setupComposedButton() {
    
        //1 添加按钮
        tabBar.addSubview(composedButton)
        
        //2 调整按钮
        let count = childViewControllers.count
        
        let w = tabBar.bounds.width / CGFloat(count) - 1
        
        composedButton.frame = CGRectInset(tabBar.bounds, 2 * w , 0)
        //3 设置监听方法
        composedButton.addTarget(self, action: "clickComposedButton", forControlEvents: .TouchUpInside)
        
    }
    
    ///添加所有的子控制器
    private func addChildViewControllers() {
        
        tabBar.tintColor = UIColor.orangeColor()
        
        addChildViewController(HomeTableViewController(), title: "首页", imageName: "tabbar_home")
        addChildViewController(MessageTableViewController(), title: "消息", imageName: "tabbar_message_center")
        addChildViewController(UIViewController())
        addChildViewController(DiscoverTableViewController(), title: "发现", imageName: "tabbar_discover")
        addChildViewController(ProfileTableViewController(), title: "我", imageName: "tabbar_profile")
    
        
    }
    
    private func addChildViewController(vc: UIViewController, title: String, imageName: String) {
        
        vc.title = title
        vc.tabBarItem.image = UIImage(named: imageName)
        
        let nav = UINavigationController(rootViewController: vc)
        
        addChildViewController(nav)
    }
}
